Revision D:
• MSZ-GA•NA and MSY-GA•NA have been added.
SPLIT-TYPE AIR CONDITIONERS
Please void OB450 REVISED EDITION-C.
INDOOR UNIT
No. OB450
SERVICE MANUAL
REVISED EDITION-D
Models
MSZ-A09NA, MSZ-A12NA, MSZ-A15NA, MSZ-A17NA, MSZ-A24NA, MSY-A15NA, MSY-A17NA, MSY-A24NA, MSZ-GA24NA
MSY-GA24NA
1
1
1
1
1
1
1
1
Outdoor unit service manual
MUZ-A·NA, GA·NA Series (OB451)
MUY-A·NA, GA·NA Series (OB451)
MXZ-A·NA Series (OB444)
CONTENTS
MSZ-A09/12/15/17NA
MSY-A15/17NA
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
For servicing of RoHS compliant products, refer to the PARTS
LIST (RoHS compliant).
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 4
3. SPECIFICATION ················································ 5
4. OUTLINES AND DIMENSIONS ························ 7
5. WIRING DIAGRAM············································ 8
6. REFRIGERANT SYSTEM DIAGRAM ··············· 9
7. SERVICE FUNCTIONS ··································· 10
8. TROUBLESHOOTING ······································11
9. DISASSEMBLY INSTRUCTIONS···················· 25
10. PARTS LIST····················································· 30
10-1. PARTS LIST ············································ 30
10-2. RoHS PARTS LIST ································· 36
11. MICROPROCESSOR CONTROL ···················· 42
Revision A:
• PARTS LIST has been revised. (10-1.8, 10-2.8)
Revision B:
• MSZ-A•NA- 1 and MSY-A•NA- 1
Remote controller has been changed.
Revision C:
• SPECIFICATION has been corrected.
Powerful has been added. (Airflow , Sound level)
Revision D:
• MSZ-GA•NA and MSY-GA•NA have been added.
2
1
TECHNICAL CHANGES
MSZ09UN
MSZ12UN
MSH15TN
MSH17TN
→
→
→
→
MSZ-A09NA
MSZ-A12NA
MSZ-A15NA
MSZ-A17NA
MSH24WN → MSZ-A24NA
MS15TN → MSY-A15NA
MS17TN → MSY-A17NA
MS24WN → MSY-A24NA
1. Control method between indoor and outdoor has been changed.
2. Indoor fan motor has been changed.
3. Signal of remote controller has been changed. (It is not available for conventional models.)
MSZ-A09NA →
MSZ-A12NA →
MSZ-A15NA →
MSZ-A17NA →
MSZ-A09NAMSZ-A12NAMSZ-A15NAMSZ-A17NA-
1
1
1
1
MSZ-A24NA →
MSY-A15NA →
MSY-A17NA →
MSY-A24NA →
MSZ-A24NAMSY-A15NAMSY-A17NAMSY-A24NA-
1
1
1
1
1. Remote controller has been changed.
• Temperature indication function (°F/°C) has been added. (Refer to 11-10.)
Models
MSZ-A09/12/15/17NA
MSZ-A09/12/15/17NAMSZ-A24NA
MSZ-A24NA - 1
MSY-A15/17NA
MSY-A15/17NA - 1
MSY-A24NA
MSY-A24NA - 1
1
Remote controller
KM06A
KM07J
KM06B
KM07K
KM06C
KM07L
KM06D
KM07M
Temperature indication
°F
°F/°C
°F
°F/°C
°F
°F/°C
°F
°F/°C
• Timer indication has been changed. (AM/PM indication)
2. Conduit plate has been removed. (MSZ-A09/12/15/17, MSY-A15/17)
3. Conduit cover, terminal block cover and terminal block holder have been changed. (MSZ-A09/12/15/17, MSY-A15/17)
MSZ-A24NAMSY-A24NA-
1
1
→ MSZ-GA24NA
→ MSY-GA24NA
1. Indoor electronic control P.C. board has been changed.
3
2
PART NAMES AND FUNCTIONS
MSZ-A09NA MSY-A15NA
MSZ-A12NA MSY-A17NA
MSZ-A15NA
Front panel
MSZ-A17NA
MSZ-A24NA MSY-A24NA
MSZ-GA24NA MSY-GA24NA
Air inlet
Heat exchanger
Panel
Air cleaning filter
(Anti-Allergy Enzyme
Filter, Blue bellows
type)
Catechin air filter
Air outlet
Vertical vane
Remote controller
Horizontal vane
Line flow fan
MSZ-A09NA
MSZ-A12NA
MSZ-A15NA
MSZ-A17NA
MSY-A15NA
MSY-A17NA
Display section
Operation section
(When the front panel is opened)
Operation Indicator
lamp
Emergency operation switch
MSZ-A24NA MSY-A24NA
MSZ-GA24NA MSY-GA24NA
Remote control
receiving section
Operation indicator lamp
Emergency operation switch
Remote control
receiving section
ACCESSORIES
Installation plate
Installation plate fixing screw 4 × 25 mm
Remote controller holder
Fixing screw for 3.5 × 1.6 mm (Black)
Battery (AAA) for remote controller
Wireless remote controller
Felt tape (Used for left or left-rear piping)
Conduit plate
MSZ-A09/12/15/17NA
MSY-A15/17NA
1
8
1
2
2
1
1
1
4
MSZ-A09/12/15/17NAMSY-A15/17NA- 1
1
5
1
2
2
1
1
–
1
MSZ-A24NA MSY-A24NA
MSZ-GA24NA MSY-GA24NA
1
7
1
2
2
1
1
–
3
SPECIFICATION
Indoor unit model
MSZ-A09NA
MSZ-A12NA
External finish
White
Power supply
V, phase, Hz
208/230, 1, 60
Max.-fuse size (time delay) / Disconnect switch
A
15
Min. circuit ampacity
A
1.0
Fan motor
Airflow
Low–Med.–High–Powerful
F.L.A
COOL Dry (Wet)
HEAT
Moisture removal
Sound level
Low–Med.–High–Powerful
CFM
0.76
152-229-307-338
(134-205-275-303)
159-222-307-321
pt./h
COOL
dB(A)
HEAT
Cond. drain connection O.D.
2.3
3.2
22-33-38-41
22-34-42-44
22-33-38-39
22-34-42-42
in.
5/8
W
Dimensions
152-240-353-388
(134-215-318-349)
159-240-353-353
30-11/16
D
in.
8-1/4
H
11-3/4
Weight
Ib.
23
Remote controller
Wireless type
12-24 VDC
Control voltage (by built-in transformer)
Indoor unit model
MSZ-A15NA
MSY-A15NA
MSZ-A17NA
External finish
Power supply
V, phase, Hz
208/230, 1, 60
Max.-fuse size (time delay) / Disconnect switch
A
15
Min. circuit ampacity
A
1.0
Fan motor
Airflow
Low–Med.–High–Powerful
F.L.A
COOL Dry (Wet)
HEAT
Moisture removal
Sound level
Low–Med.–High–Powerful
CFM
0.76
268-328-381-419 (240-293-342-376)
254-314-381-381
pt./h
COOL
dB(A)
HEAT
Cond. drain connection O.D.
—
254-314-381-381
4.7
34-40-45-47
34-38-44-44
34-40-46-48
—
34-38-44-44
in.
30-11/16
D
in.
8-1/4
11-3/4
Weight
Ib.
23
Remote controller
Wireless type
Control voltage (by built-in transformer)
12-24 VDC
Indoor unit model
MSZ-A24NA
MSZ-GA24NA
External finish
MSY-A24NA
V, phase, Hz
208/230, 1, 60
Max.-fuse size (time delay) / Disconnect switch
A
15
Min. circuit ampacity
A
1.0
Fan motor
F.L.A
COOL Dry (Wet)
HEAT
Moisture removal
CFM
0.76
296-431-568-624 (265-385-508-558)
296-486-568-590
350-486-568-590
pt./h
COOL
HEAT
Cond. drain connection O.D.
34-40-49-51
dB(A)
34-40-48-49
in.
D
—
5/8
43-5/16
in.
10-1/4
H
Weight
—
7.3
W
Dimensions
MSY-GA24NA
White
Power supply
Sound level
Low–Med.–High–Powerful
—
5/8
H
Airflow
Low–Med.–High–Powerful
—
5.2
W
Dimensions
MSY-A17NA
White
12-13/16
Ib.
37
Remote controller
Wireless type
12-24 VDC
Control voltage (by built-in transformer)
NOTE: Test conditions are based on ARI 210/240.
Rating conditions
(Cooling) — Indoor: 80˚FDB, 67˚FWB, Outdoor: 95˚FDB, (75˚FWB) Rated frequency
(Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 47˚FDB, 43˚FWB Rated frequency
(Heating) — Indoor: 70˚FDB, 60˚FWB, Outdoor: 17˚FDB, 15˚FWB Maximum frequency
5
3-1. OPERATING RANGE
(1) POWER SUPPLY
Rated voltage
Guaranteed Voltage (V)
208/230 V
1 phase
60 Hz
Indoor unit
Min.187
208
230
Max.253
(2) OPERATION
Intake air temperature (°F)
Mode
Condition
Indoor
Standard temperature
Maximum temperature
Cooling
Minimum temperature
Maximum humidity
Standard temperature
Heating Maximum temperature
Minimum temperature
DB
80
90
67
Outdoor
WB
67
73
57
DB
95
115
14
78%
WB
—
—
—
—
70
80
60
67
70
60
47
75
14
5 (MUZ-GA24)
43
65
13
4 (MUZ-GA24)
Except -
U
model
3-2. OUTLET AIR SPEED AND COVERAGE RANGE
Model
MSZ-A09NA
MSZ-A15NA
MSZ-A15NA
MSY-A15NA
MSZ-A17NA
MSZ-A17NA
MSY-A17NA
MSZ-A24NA
MSZ-GA24NA
MSZ-A24NA
MSY-A24NA
MSZ-GA24NA
MSY-GA24NA
Coverage
range (ft.)
23.4
23.4
21.0
26.7
26.7
24.1
28.8
28.8
26.0
28.8
28.8
26.0
Dry
568
20.2
34.4
Dry
568
20.2
34.4
Wet
508
18.1
30.9
Function
Air flow (CFM)
HEAT
Dry
Dry
Wet
Dry
Dry
Wet
Dry
Dry
Wet
Dry
Dry
Wet
COOL
HEAT
MSZ-A12NA
307
307
275
353
353
318
381
381
342
381
381
342
Air speed
(ft./sec.)
16.8
16.8
15.1
19.3
19.3
17.4
20.9
20.9
18.8
20.9
20.9
18.8
Mode
COOL
HEAT
COOL
HEAT
COOL
HEAT
COOL
6
● The air coverage range is the figure up to the position where the
air speed is 1 ft./sec., when air is
blown out horizontally from the
unit properly at the High speed
position.
The coverage range should be
used only as a general guideline
since it varies according to the
size of the room and furniture arranged inside the room.
4
OUTLINES AND DIMENSIONS
MSZ-A09NA MSY-A15NA MSZ-A12NA MSY-A17NA MSZ-A15NA MSZ-A17NA
Indoor unit
7/8 hole
7/8
6-1/8
2-3/16
6-1/8
1-3/4
12-5/8
13-3/16
2-3/4
Air in
Wall hole ø2-9/16
8-1/4
2-1/8
24-9/16
3/16
4
Installation plate
{
3/4
6-1/4
2-5/16
9/16
2-3/16
1/8
8-7/8
10-1/8
8-7/16
1-5/8
11-3/4
8-7/8
2-3/16
1-11/16
Installation plate
and MSY-A•NA- are excluded.)
7/16x13/16 Oblong hole
8-7/16
9-3/16
10-3/4
11-5/16
Conduit plate(MSZ-A•NA7/16x1 Oblong hole
30-11/16
Unit: inch
Liquid line ø1/4 19-11/16
Gas line ø3/8 16-15/16
Insulation ø1-3/8 O.D
ø3/4 I.D
Drain hose ø5/8
(Connected part O.D)
Air out
Insulation ø1-1/8
MSZ-A24NA MSY-A24NA MSZ-GA24NA MSY-GA24NA
Installation plate
Indoor unit
3-7/8
3-7/8
16-5/16
16-5/16
6-13/16
1-7/8
43-5/16
1/8
1-7/8
10-1/16
5/16
6-13/16
12-3/8
42-1/16
12-13/16
Wall hole ø3
10-1/4
Air in
2-3/16
Installation plate
{
9-15/16
Liquid line ø1/4 19-11/16
Gas line ø5/8 16-15/16
Insulation ø1-15/16 O.D
ø1-1/4 I.D
3/4
6-1/4
2-5/16
31-1/8
3/16
Air out
Drain hose ø5/8
(Connected part O.D)
Insulation ø1-1/8
Wireless remote controller
7
5
WIRING DIAGRAM
MSZ-A09NA MSY-A15NA MSZ-A12NA MSY-A17NA MSZ-A15NA MSZ-A17NA
MSZ-A24NA MSY-A24NA
MSZ-GA24NA MSY-GA24NA
8
6
REFRIGERANT SYSTEM DIAGRAM
MSZ-A09NA
MSZ-A12NA
MSZ-A15NA MSY-A15NA
MSZ-A17NA MSY-A17NA
Refrigerant pipe ø1/2
(with heat insulator)
Refrigerant pipe ø3/8
(with heat insulator)
Indoor
heat
exchanger
Unit: inch
Indoor coil
thermistor
RT12(main)
Indoor
heat
exchanger
Flared connection
Indoor coil
thermistor
RT12(main)
Distributor
Flared connection
Indoor coil
thermistor
RT13(sub)
Indoor coil
thermistor
RT13(sub)
Room temperature
thermistor
RT11
Room temperature
thermistor
RT11
Flared connection
Flared connection
Refrigerant pipe ø1/4
(with heat insulator)
Refrigerant pipe ø1/4
(with heat insulator)
MSZ-A24NA MSY-A24NA
MSZ-GA24NA MSY-GA24NA
Refrigerant pipe ø5/8
(with heat insulator)
Indoor
heat
exchanger
Indoor coil
thermistor
RT12(main)
Distributor
Flared connection
Indoor coil
thermistor
RT13(sub)
Room temperature
thermistor
RT11
Flared connection
Refrigerant flow in cooling
Refrigerant pipe ø1/4
(with heat insulator)
Refrigerant flow in heating
9
7
SERVICE FUNCTIONS
MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSZ-A24NA MSY-A15NA
MSY-A17NA MSY-A24NA MSZ-GA24NA MSY-GA24NA
7-1. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS on the indoor electronic control P.C. board.
The time will be shortened as follows. (Refer to 8-7.)
Set time: 1-minute → 1-second
Set time: 3-minute → 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is
shortened by short circuit-of JPG and JPS.)
7-2. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION
A maximum of 4 indoor units with wireless remote controllers can be used in a room.
In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be
modified according to the number of the indoor unit.
How to modify the remote controller P.C. board
Remove batteries before modification.
The board has a print as shown below:
J1
NOTE: For modification, take out
the batteries and press the
OPERATE/STOP (ON/OFF)
button twice or 3 times at
first.
After finish modification,
put back the batteries then
press the RESET button.
J2
The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in Table 1.
After modification, press the RESET button.
Table 1
No. 1 unit
No. 2 unit
No. 3 unit
No. 4 unit
1 unit operation
No modification
—
—
—
2 units operation
Same as at left
Solder J1
—
—
3 units operation
Same as at left
Same as at left
Solder J2
—
4 units operation
Same as at left
Same as at left
Same as at left
Solder both J1 and J2
How to set the remote controller exclusively for particular indoor unit
After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote
controller for the indoor unit.
The indoor unit will only accept the signal from the remote controller that has been assigned to the indoor unit once they are
set.
The setting will be cancelled if the breaker has turned OFF, or the power supply has shut down.
Please conduct the above setting once again after the power has restored.
10
7-3. AUTO RESTART FUNCTION
When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed
are memorized by the indoor electronic control P.C. board. The “AUTO RESTART FUNCTION” sets to work the moment
power has restored after power failure. Then, the unit will restart automatically.
Operation
If the main power has been cut, the operation settings remain.
After the power is restored, the unit restarts automatically according to the memory.
(However, it takes at least 3 minutes for the compressor to start running.)
How to release “AUTO RESTART FUNCTION”
Turn OFF the main power of the unit.
Solder the Jumper wire JR07 on the indoor electronic control P.C. board. (Refer to 8-7.)
MSZ-A09/12/15/17NA
MSY-A15/17NA
BZ
JR07
BZ
CN101
CN151
JR07
CN112
CN152
CN151
CN112
CN211
CN211
MSZ-A24NA MSY-A24NA
MSZ-GA24NA MSY-GA24NA
NOTE:
• The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the
remote controller.
• If main power is turned OFF or a power failure occurs while AUTO START/STOP timer is active, the timer setting is
cancelled.
• If the unit has been OFF with the remote controller before power failure, the auto restart function does not work as
the power button of the remote controller is OFF.
• To prevent breaker OFF due to the rush of starting current, systematize other home appliance not to turn ON at the
same time.
• When some air conditioners are connected to the same supply system, if they are operated before power failure, the
starting current of all the compressors may flow simultaneously at restart.
Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting
current by adding to the system that allows the units to start one by one.
8
TROUBLESHOOTING
MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSZ-A24NA MSY-A15NA
MSY-A17NA MSY-A24NA MSZ-GA24NA MSY-GA24NA
8-1. CAUTIONS ON TROUBLESHOOTING
1. Before troubleshooting, check the following
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for miswiring.
2. Take care of the following during servicing
1) Before servicing the air conditioner, be sure to turn OFF the unit first with the remote controller, and then after confirming the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic
control P.C. board.
3) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the
components.
4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
Lead wiring
Housing point
11
3. Troubleshooting procedure
1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing ON and OFF to indicate an abnormality.
To make sure, check how many times the abnormality indication is flashing ON and OFF before starting service work.
2) Before servicing check that the connector and terminal are connected properly.
3) When the electronic control P.C. board seems to be defective, check the copper foil pattern for disconnection and the
components for bursting and discoloration.
4) When troubleshooting, refer to 8-2., 8-3. and 8-4.
4. How to replace batteries
Weak batteries may cause the remote controller malfunction.
In this case, replace the batteries to operate the remote controller normally.
Press RESET button with tip end of ball point pen
or the like, and then use the remote controller.
Remove the front lid and insert batteries.
Then reattach the front lid.
Insert the negative pole of the
batteries first. Check if the polarity
of the batteries is correct.
RESET button
NOTE: 1. If RESET button is not pressed, the remote controller may not operate correctly.
2. This remote controller has a circuit to automatically reset the microprocessor control when batteries are replaced.
This function is equipped to prevent the microprocessor control from malfunctioning due to the voltage drop caused
by the battery replacement.
INFORMATION FOR MULTI SYSTEM AIR CONDITIONER
OUTDOOR UNIT: MXZ series
Multi system air conditioner can connect two or more indoor units with one outdoor unit.
• When you try to operate two or more indoor units with one outdoor unit simultaneously, one for the cooling and the
other for heating, the operation mode of the indoor unit that operates earlier is selected. Other indoor units cannot
operate, and operation indicator lamp flashes as shown in the figure below. In this case, please set all the indoor
units to the same operation mode.
OPERATION INDICATOR
Lighted
Blinking
Not lighted
• When indoor unit starts the operation while the defrosting of outdoor unit is being done, it takes a few minutes (max.
10 minutes) to blow out the warm air.
• In the heating operation, though indoor unit that does not operate may get warm or the sound of refrigerant flowing
may be heard, they are not malfunction. The reason is that the refrigerant continuously flows into it.
12
8-2. FAILURE MODE RECALL FUNCTION
Outline of the function
This air conditioner can memorize the abnormal condition which has occurred once.
Even though LED indication listed on the troubleshooting check table (8-4.) disappears, the memorized failure details can
be recalled.
1. Flow chart of failure mode recall function for the indoor/outdoor unit
Those figures show about MSZ-A09/12/15/17.
Operational procedure
The cause of abnormality cannot be found because the abnormality does not recur.
Setting up the failure mode recall function
Turn ON the power supply.
<Preparation of the remote controller>
While pressing both OPERATION SELECT button and TOO COOL button on the
remote controller at the same time, press RESET button.
First, release RESET button.
And release the other two buttons after all LCD in operation display section of the
remote controller is displayed after 3 seconds.
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature
is displayed) with the remote controller headed towards the indoor unit. 1
1. Regardless of normal or abnormal condition, a short
beep is emitted once the signal is received.
Does the left lamp of OPERATION INDICATOR lamp on the
indoor unit blink at the interval of 0.5 seconds?
Blinks: Either indoor or outdoor unit is abnormal. Beep is emitted at the same timing as the blinking of the left lamp
of OPERATION INDICATOR lamp. 2
Judgment of indoor/outdoor abnormality
No
(OFF)
Indoor unit is normal.
But the outdoor unit might be abnormal because there are some abnormalities that cannot be recalled with this way.
Confirm if outdoor unit is abnormal according to the detailed outdoor
unit failure mode recall function.
Yes
(Blinks)
Before blinking, does the left lamp of OPERATION INDICATOR lamp stay ON for 3 seconds?
Stays ON for 3 seconds (without beep):
The outdoor unit is abnormal.
No
Yes
The indoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal point with the indoor unit
failure mode table. (8-2.2.)
Make sure to check at least two consecutive blinking cycles. 2
The outdoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal point with the
outdoor unit failure mode table. (Refer to outdoor unit service manual.)
Make sure to check at least two consecutive blinking cycles. 3
Releasing the failure mode recall function
Release the failure mode recall function by the following procedures.
Turn OFF the power supply and turn it ON again.
Press RESET button of the remote controller.
Repair the defective parts.
Deleting the memorized abnormal condition
After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall
function" mentioned above.
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed)
with the remote controller headed towards the indoor unit.
Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.
Release the failure mode recall function according to "Releasing the failure mode recall function"
mentioned above.
NOTE: 1. Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly.
2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.
2. Blinking pattern when the indoor unit is abnormal:
Blinking at 0.52.5-second OFF second interval
Blinking at 0.52.5-second OFF second interval
ON
OFF
Beeps
Repeated cycle
Beeps
Repeated cycle
3.Blinking pattern when the outdoor unit is abnormal:
Blinking at 0.52.5-second OFF
3-second ON
second interval
2.5-second OFF
Beeps
Repeated cycle
3-second ON
Blinking at 0.5second interval
ON
OFF
No beep
Repeated cycle
Beeps
No beep
Repeated cycle
13
Beeps
Repeated cycle
2. Indoor unit failure mode table
Left lamp of OPERATION Abnormal point
INDICATOR lamp
(Failure mode)
Not lighted
Normal
Condition
Correspondence
—
The room temperature thermistor short or
1-time flash every Room temperature
open circuit is detected every 8 seconds dur0.5-second
thermistor
ing operation.
Indoor coil
2-time flash
The indoor coil thermistor short or open circuit
2.5-second OFF
is detected every 8 seconds during operation.
thermistor
3-time flash
The serial signal from outdoor unit is not reSerial signal
2.5-second OFF
ceived for a maximum of 6 minutes.
The rotational frequency feedback signal is not
11-time flash
Indoor fan motor
emitted during the 12 seconds the indoor fan
2.5-second OFF
operation.
It cannot properly read data in the nonvolatile
12-time flash
Indoor control
memory of the indoor electronic control P.C.
2.5-second OFF
system
board.
—
Refer to the characteristics of the room temperature
thermistor (8-7.).
Refer to the characteristics of the main indoor coil thermistor, the sub indoor coil thermistor (8-7.).
Refer to 8-6. "How to check miswiring and serial
signal error".
Refer to 8-6.
"Check of indoor fan motor".
Replace the indoor electronic control P.C. board.
NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (8-4.).
14
8-3. INSTRUCTION OF TROUBLESHOOTING
Start
Indoor unit operates.
Outdoor unit
does not operate.
Indoor unit operates.
Outdoor unit does
not operate normally.
Indoor unit does
not receive the
signal from remote controller.
OPERATION INDICATOR
lamp on the indoor unit is
flashing ON and OFF.
If blinking of OPERATION INDICATOR lamp cannot be checked,
it can be checked with failure
mode recall function.
Outdoor unit
operates only
in Test Run
operation.
Outdoor unit
does not
operate even
in Test Run
operation.
Unit does not
operate normal operation
in COOL or
HEAT mode.
Indoor unit
operates, when
EMERGENCY
OPERATION
switch is pressed.
Indoor unit does
not operate, when
EMERGENCY
OPERATION
switch is pressed.
Check room
temperature
thermistor.
Refer to 8-7.
"Test point
diagram and
voltage".
Refer to "How
to check
inverter/compressor".
Refer to
"Check of R.V.
coil".
Refer to 8-6.
"Check of remote
controller and
receiver P.C.
board".
1. Check indoor/outdoor connecting wire.
(Check if the power is
supplied to the indoor
unit.)
2. Refer to 8-6. "Check
of indoor electronic
control P.C. board and
indoor fan motor".
"Test Run operation" means
the operation within 30 minutes
after EMERGENCY OPERATION switch is pressed.
Refer to outdoor unit service manual.
Left lamp
Flash on
and OFF at
0.5-second
intervals
Cause:
Indoor/Outdoor
unit
• Miswiring or
trouble of
serial signal
Left lamp
2-time flash
Cause:
Indoor unit
• Trouble
of room
temperature
/ indoor coil
thermistor
Left lamp
3-time flash
Cause:
Indoor unit
• Trouble of
indoor fan
motor
Left lamp
4-time flash
Cause:
Indoor unit
• Trouble
of indoor
unit control
system
Left lamp
5-time flash
Cause:
Outdoor unit
• Outdoor
power
system
abnormality
Left lamp
6-time flash
Cause:
Outdoor unit
• Trouble of
thermistor in
outdoor unit
Left lamp
7-time flash
Cause:
Outdoor unit
• Trouble of
outdoor control system
Left lamp
14-time flash
Cause:
Outdoor unit
• Other abnormality
Refer to 8-6.
"How to
check miswiring and
serial signal
error".
Check room Refer to 8-6.
temperature
"Check of
thermistor
indoor fan
and indoor
motor".
coil thermistor. Refer
to 8-7."Test
point diagram
and voltage".
Replace the
indoor electronic control
P.C. board.
Refer to
"How to
check
inverter/compressor".
Refer to
"Check of
outdoor thermistors".
Replace the
inverter P.C.
board or
the outdoor
electronic
control P.C.
board.
Check "Flow
chart of the
detailed
outdoor unit
failure mode
recall function."
15
8-4. TROUBLESHOOTING CHECK TABLE
Before taking measures, make sure that the symptom reappears for accurate troubleshooting.
When the indoor unit has started operation and detected an abnormality of the following condition (the first detection after the
power ON), the indoor fan motor turns OFF and OPERATION INDICATOR lamp flashes.
OPERATION INDICATOR
No.
1
Abnormal
point
Miswiring
or serial
signal
Indoor coil
thermistor
2
Room temperature
thermistor
Lighted
Blinking
Not lighted
Operation indicator lamp
Symptom
Condition
Left lamp flashes.
0.5-second ON
The serial signal from the outdoor unit is not
received for 6 minutes.
0.5-second OFF
Left lamp flashes.
2-time flash
Correspondence
• Refer to 8-6. "How to check
miswiring and serial signal error".
The indoor coil or the room temperature thermistor is short or open circuit.
• Refer to 8-7. the characteristics
of indoor coil thermistor, and
the room temperature thermistor.
The rotational frequency feedback signal is
not emitted during the indoor fan operation.
• Refer to 8-6. "Check of indoor fan motor".
It cannot properly read data in the nonvolatile
memory of the indoor electronic control P.C.
board.
• Replace the indoor electronic
control P.C. board.
2.5-second OFF
Left lamp flashes.
3-time flash
3
Indoor fan
motor
2.5-second OFF
Left lamp flashes.
4-time flash
4
Indoor control system
2.5-second OFF
5
Outdoor
power system
Left lamp flashes.
5-time flash
Indoor unit and
outdoor unit do
not operate.
2.5-second OFF
• Refer to "How to check of inIt consecutively occurs 3 times that the comverter/compressor".
pressor stops for overcurrent protection or
Refer to outdoor unit service
start-up failure protection within 1 minute after
manual
start-up.
• Check the stop valve.
Left lamp flashes.
6-time flash
6
Outdoor
thermistors
The outdoor thermistors short or open circuit
during the compressor operation.
• Refer to "Check of outdoor
thermistor".
Refer to outdoor unit service
manual.
It cannot properly read data in the nonvolatile
memory of the inverter P.C. board or the outdoor electronic control P.C. board.
• Replace the inverter P.C. board
or the outdoor electronic control P.C. board.
Refer to outdoor unit service
manual.
An abnormality other than above mentioned
is detected.
• Check the stop valve.
• Confirm the abnormality in
detail using the failure mode
recall function for outdoor unit.
It cannot properly read data in the nonvolatile
memory of the inverter P.C. board or the outdoor electronic control P.C. board.
• Check the blinking pattern of
the LED on the inverter P.C.
board or the outdoor electronic
control P.C. board.
2.5-second OFF
7
Outdoor
control system
Left lamp flashes.
7-time flash
2.5-second OFF
Left lamp flashes.
14-time flash
8
Other abnormality
2.5-second OFF
9
Outdoor
control
system
MSZ-A09/12
/15/17
MSY-A15/17
Left lamp lights up
Outdoor unit
does not operate
16
OPERATION INDICATOR
No.
Abnormal
point
Operation indicator lamp
Symptom
Condition
Correspondence
Left lamp lights and lower lamp flashes.
1
MXZ type
Operation
mode
setting
The operation mode of the each indoor unit
Outdoor unit
is differently set to COOL (includes DRY) and • Unify the operation mode.
operates but
HEAT at the same time, the operation mode
Refer to outdoor unit service
indoor unit does
of the indoor unit that has operated at first has manual.
not operate.
the priority.
2.5-second OFF
8-5. TROUBLE CRITERION OF MAIN PARTS
MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSZ-A24NA MSY-A15NA
MSY-A17NA MSY-A24NA MSZ-GA24NA MSY-GA24NA
Part name
Room temperature
thermistor(RT11)
Check method and criterion
Figure
Measure the resistance with a tester.
Refer to 8-7. "Test point diagram and voltage",
Indoor coil thermistor
"Indoor electronic control P.C. board", for the chart of thermistor..
(RT12(MAIN),RT13(SUB))
Indoor fan motor(MF)
Horizontal vane
motor(MV)
MSZ-A09/12/15/17NA
MSY-A15/17NA
Horizontal vane
motor(MV1)
Vertical vane
motor(MV2)
A24NA, GA24NA
Check 8-6.
.
Measure the resistance between the terminals with a tester.
(Part temperature 50 ~ 86°F)
Color of the lead wire
Normal
BRN-other one
235 ~ 255 Ω
RED
ROTOR
YLW
BRN
ORN
Measure the resistance between the terminals with a tester.
(Part temperature 50 ~ 86°F)
Color of the lead wire
Normal
BRN-other one
282 ~ 306 Ω
RED
ROTOR
YLW
BRN
ORN
17
GRN
GRN
8-6. TROUBLESHOOTING FLOW
A Check of indoor fan motor
The indoor fan motor error has occurred, and the indoor fan does not operate.
Turn OFF the power supply.
Pay careful attention to the high voltage on the fan motor connector CN211.
Is there any foreign matter that interferes
the rotation of the line flow fan?
Turn ON the power supply, wait 5 seconds or more, and then press
EMERGENCY OPERATION switch.
Measure the supply voltage as follows within 12 seconds after EMERGENCY OPERATION switch is pressed.
If more than 12 seconds passes by, turn OFF the power supply and
turn ON it again, then measure the voltage.
1. Measure the voltage between CN211 (+) and (-).
2. Measure the voltage between CN211 (+) and (-).
No
Yes
If more than 12 seconds passes after EMERGENCY OPERATION switch
is pressed, the voltage mentioned above 2 goes 0 VDC although the
indoor electronic control P.C. board is normal
Remove the foreign matter and
adjust the line flow fan.
Is there 294/325 VDC between
CN211 (+) and (-), and does the
voltage between CN211 (+) and (-)
rise to the range of 3 to 6 VDC within
12 seconds after EMERGENCY
OPERATION switch is pressed?
CN211
Yes
Replace the indoor fan motor.
Indoor electronic
control P.C. board
No
Replace the indoor electronic control P.C. board.
The indoor fan motor error has occurred, and the indoor fan repeats "12-second ON and 30-second OFF" 3 times, and then stops.
Measure the voltage between CN211
(+) and (-) while the fan motor is
rotating.
Is it unchanged holding
0 or 15 VDC?
Yes
(Unchanged)
Replace the indoor fan motor.
18
No
(Changed)
Replace the indoor electronic control P.C. board.
B Check of remote controller and indoor electronic control P.C. board
Check if the remote controller is exclusive for this air conditioner.
Press OPERATE/STOP (ON/OFF)
button on the remote controller.
Is LCD display on the remote controller
visible?
Yes
No
(Not clear)
Replace the batteries. (Refer to 8-1.4.)
Remove the batteries, then set them back
and press RESET button. (Refer to 8-1.4.)
Check if the unit operates with the remote
controller.
Does the unit operate with the remote
controller?
No
Turn ON a radio to AM and press OPERATE/STOP (ON/OFF) button on the
remote controller.
Yes
Is noise heard from radio?
OK
No
Replace the remote controller.
Yes
Are there any fluorescent lights of
inverter or rapid-start type within the
range of 3.28 ft.?
No
MSZ-A24NA MSY-A24NA
MSZ-GA24NA MSY-GA24NA
Yes
• Reinstall the unit away from lights.
• Attach a filter on receiving part.
MSZ-A09/12/15/17NA
MSY-A15/17NA
Measure the voltage between receiver
P.C. board connector CN301 No.2(+) and
No.3(-) when the remote controller button
is pressed.
Is the voltage approx. 4 VDC?
Replace the indoor electronic control
P.C. board.
Yes
No (5 or 0 VDC)
Replace the receiver P.C. board.
19
C Check of indoor electronic control P.C. board and indoor fan motor
Turn OFF the power supply.
Remove indoor fan motor connector CN211
and vane motor connector CN151 from the
indoor electronic control P.C. board and turn
ON the power supply.
Does the unit operate with the remote
controller? Does OPERATION INDICATOR
lamp light up by pressing EMERGENCY
OPERATION switch?
No
Measure the resistance between
CN211 and of the indoor fan motor
connector.
Short/open circuit:
Replace the indoor fan motor.
Measure the resistance of the horizontal vane motor coil.
(Refer to 8-5.)
Short/open circuit:
Replace the horizontal vane motor and the
indoor electronic control P.C. board.
Yes
Replace the indoor
electronic control P.C. board.
Yes
Are the varistor (NR11)
burnt and the fuse (F11)
blown?
Turn OFF the power supply.
Check both “parts side” and “pattern
side” of the indoor electronic control
P.C. board visually.
No
Be sure to check both the fuse
and the varistor in any case.
Is the fuse (F11) blown
only?
No
Yes
Measure the resistance between
(+) and (-) of the indoor fan motor
connector (to CN211 on the indoor
electronic control P.C. board). 1, 2
Is the resistance 1 MΩ
or more?
Yes
No
1. The fan motor connector's
black.
lead wire is red, whereas
is
2. Connect "+" of the tester to fan motor connector's lead
wire, and "-" to lead wire, otherwise the resistance cannot be measured properly.
Replace indoor electronic control P.C. board
and the indoor fan motor.
Replace indoor electronic control
P.C. board.
Measure the resistance of resistor (R111) on the indoor electronic
control P.C. board.
Is the resistance approx.
4 Ω?
No
Replace the indoor electronic control P.C.
board and the indoor fan motor.
Yes
Replace the indoor electronic control P.C. board.
Indoor electronic
control P.C.Board
Varistor(NR11)
Fuse(F11)
CN211
20
D How to check miswiring and serial signal error
Turn OFF the power supply.
Is there rated voltage in the
power supply?
Check the power supply.
No
Yes
Turn ON the power supply.
Is there rated voltage between
outdoor terminal block S1 and
S2?
Yes
Check the wiring.
No
Press EMERGENCY OPERATION switch once.
Does the left lamp of OPERATION INDICATOR lamp light up? <Confirmation of the
power to the indoor unit>
Yes
No
Is serial signal error indicated 6 minutes later?
No
Yes
Is there any miswiring, poor
contact, or wire disconnection of the indoor/outdoor
connecting wire?
Yes
Correct them.
No
A
Turn OFF the power supply.
Check once more if the indoor/outdoor
B connecting wire is not miswiring.
Short-circuit outdoor terminal block S2
and S3. 1
1. Miswiring may damage indoor electronic control P.C.
board during the operation.
Be sure to confirm the wiring is correct before the operation starts.
3. Be sure to check this within 3 minutes after turning ON.
After 3 minutes, LED blinks 6 times. Even when the
inverter P.C. board or the outdoor electronic control P.C.
board is normal, LED blinks 6 times after 3 minutes.
(Except for outdoor unit of multi system type)
Turn ON the power supply.
Does the LED on the inverter P.C. board or
the outdoor electronic control P.C. board
repeat "3.6-second-OFF and 0.8-secondON quick blinking"? 3
Yes
A
• Turn OFF inverter-controlled lighting
equipment.
• Turn OFF the power supply and then
turn ON again.
• Press EMERGENCY OPERATION
switch.
Is serial signal
error indicated 6
minutes later?
Yes
B
• Reinstall
either the unit
or the light
away from
each other.
• Attach a filter
No on remote
control
receiving
section of the
indoor unit.
Turn OFF the power supply.
Remove the short-circuit between
outdoor terminal block S2 and S3.
Turn ON the power supply.
Is there amplitude of 10 to 20 VDC
between outdoor terminal block S2 and
S3? <Confirmation of serial signal>
Yes
Is there rated voltage between
indoor terminal block S1 and S2?
<Confirmation of power voltage>
Yes
No
(Lighted
or not
lighted)
2. Be careful to the residual voltage
of smoothing capacitor.
No
Is there any error of the indoor/outdoor connecting wire,
such as the damage of the wire,
Yes
intermediate connection, poor
contact to the terminal block?
No
No
Is there any error of the indoor/outdoor connecting wire,
such as the damage of the wire,
Yes
intermediate connection, poor
contact to the terminal block?
No
Replace the indoor electronic control P.C. board.
Be sure to release the failure-mode recall function
after checking.
21
Replace the inverter P.C. board or
the outdoor electronic control P.C. board.
2
Replace the indoor/
outdoor connecting
wire.
Replace the indoor/
outdoor connecting
wire.
E Electromagnetic noise enters into TV sets or radios
Is the unit grounded?
No
Ground the unit.
Yes
Is the distance between the antennas
and the indoor unit within 9.91 ft., or is
the distance between the antennas and
the outdoor unit within 9.91 ft.?
Yes
Extend the distance between the antennas and
the indoor unit, and/or the antennas and the
outdoor unit.
Yes
Extend the distance between the TV sets and/or
radios and the indoor unit, or the TV sets or
radios and the outdoor unit.
Yes
Replace or repair the antenna.
Replace or repair the coaxial cable.
Yes
Extend the distance between the indoor/outdoor
connecting wire of the air conditioner and the wiring of the antennas.
No
Is the distance between the TV sets or
radios and the indoor unit within 3.28
ft., or is the distance between the TV
sets or radios and the outdoor unit
within 9.91 ft.?
No
Are the antennas damaged?
Is the coaxial cable damaged?
Is there any poor contact in the antenna wiring?
No
Is the indoor/outdoor connecting wire of
the air conditioner and the wiring of the
antennas close?
No
Even if all of the above conditions are fulfilled, the electromagnetic noise may enter, depending on the electric field strength
or the installation condition (combination of specific conditions such as antennas or wiring).
Check the followings before asking for service.
1. Devices affected by the electromagnetic noise
TV sets, radios (FM/AM broadcast, shortwave)
2. Channel, frequency, broadcast station affected by the electromagnetic noise
3. Channel, frequency, broadcast station unaffected by the electromagnetic noise
4. Layout of:
indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, grounding wire, antennas, wiring from antennas, receiver
5. Electric field intensity of the broadcast station affected by the electromagnetic noise
6. Presence or absence of amplifier such as booster
7. Operation condition of air conditioner when the electromagnetic noise enters in
1) Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic
noise.
2) Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) button on the remote controller for
power ON, and check for the electromagnetic noise.
3) After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the electromagnetic noise.
4) Press OPERATE/STOP (ON/OFF) button on the remote controller for power OFF, when the outdoor unit stops but the
indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise.
22
8-7. Test point diagram and voltage
MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA
MSY-A15NA MSY-A17NA
Indoor electronic control P.C. board
Power supply input
208/230 VAC
}
Varistor (NR11)
Fuse (F11)
250 V 3.15 A
Resistor
(R111)
Indoor fan motor
(CN211)
294/325 VDC
(-) Fiducial terminal of
cathode side on measuring high-voltage DC
15 VDC
(+)3-6 VDC
(+)0 or 15 VDC
Release of Auto restart
function
Solder the Jumper wire
to JR07
(Refer to 7-3.)
5 VDC
Indoor coil thermistor
RT12(MAIN)
RT13(SUB)
(CN112)
Horizontal vane
motor(CN151)
Room temperature
thermistor (RT11)
}
Power monitor
receiver P.C.
board
Timer short mode
point JPG, JPS
(Refer to 7-1.)
12 VDC
Emergency
operation switch
Resistance (k )
Indoor coil thermistor [RT12 (MAIN), RT13 (SUB)]
Room temperature thermistor (RT11)
SW P.C. board
Temperature (°F)
23
MSZ-A24NA MSY-A24NA MSZ-GA24NA MSY-GA24NA
Indoor electronic control P.C. board
Resistor
(R111)
Varistor (NR11)
Power supply input
208/230 VAC
}
Release of Auto restart
function
Solder the Jumper wire
to JR07
(Refer to 7-3.)
Fuse (F11)
250 V 3.15 A
Indoor fan motor
(CN211)
294/325 VDC
(-) Fiducial terminal of
cathode side on measuring high-voltage DC
Display
P.C.
board
15 VDC
(+)3-6 VDC
(+)0 or 15 VDC
5 VDC
Indoor coil thermistor RT12(MAIN)
RT13(SUB)
Horizontal vane
motor (CN151)
Room temperature
thermistor (RT11)
}
12 VDC
Receiver
P.C. board
Timer short
mode point
JPG, JPS
(Refer to 7-1.)
Vertical vane motor (CN152)
Indoor coil thermistor [RT12 (MAIN), RT13 (SUB)]
Room temperature thermistor (RT11)
Resistance (k )
SW P.C. board
Temperature (°F)
24
9
DISASSEMBLY INSTRUCTIONS
<"Terminal with locking mechanism" Detaching points>
The terminal which has the locking mechanism can be detached as shown below.
There are two types (refer to (1) and (2)) of the terminal with locking mechanism.
The terminal without locking mechanism can be detached by pulling it out.
Check the shape of the terminal before detaching.
(1) Slide the sleeve and check if there is a locking lever or not.
(2) The terminal with this connector has the
locking mechanism.
Sleeve
Locking lever
Slide the sleeve.
Pull the terminal while
pushing the locking
lever.
Hold the sleeve, and
pull out the terminal
slowly.
Connector
9-1. MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSY-A15NA MSY-A17NA
OPERATING PROCEDURE
PHOTOS
1. Removing the panel
Photo 1
(1) Remove the horizontal vane.
(2) Remove the screw caps of the panel. Remove the
screws. (Photo 1)
(3) Hold the lower part of both ends on the panel and pull
it slightly toward you, and then remove the panel by
pushing it upward.
Photo 3
Screws of the panel
Horizontal vane
Screw of the
conduit cover
Terminal block
cover
Photo 2
Conduit cover
Terminal block
cover
Conduit cover
MSZ-A09/12/15/17NA MSY-A15/17NA -
Screw of the
conduit cover
1
1
Conduit plate
MSZ-A09/12/15/17NA
MSY-A15/17NA
25
OPERATING PROCEDURE
PHOTOS
2. Removing the electronic control P.C. board, the
power monitor receiver P.C. board, SW P.C. board
and the terminal block
(1) Remove the horizontal vane, the panel (refer to 1.) and the
corner box.
(2) Remove the screw of the conduit cover, and conduit cover.
(Photo 2 or Photo 3)
(3) Remove the indoor/outdoor connecting wire.
(4) Remove the switch holder from the electrical cover. (Photo
4)
(5) Remove the screw of the electrical cover, and then the
electrical cover. (Photo 4)
(6) Remove the ground wire connected to the indoor electronic
control P.C. board from the electrical box. (Photo 5)
(7) Unhook the power monitor receiver P.C. board holder from
the catch. (Photo 4)
(8) Open the rear cover of the power monitor receiver P.C.
board holder and pull out the power monitor receiver P.C.
board.
(9) Open the switch holder and pull out SW P.C. board.
(10) Pull the electronic control P.C. board slightly toward you
from the electrical box, and disconnect TAB3 and all the
connectors on the electronic control P.C. board. (LD101
and LD105 are direct-mounted to the electronic control P.C.
board.)
(11) Pull out the electronic control P.C. board from the electrical
box.
(12) Remove the ground wire connected to the heat exchanger
from the electrical box. (Photo 5)
(13) Unhook the catches of the electrical box, and pull out the
electrical box.
(14) Remove the screw of the terminal block cover, and then
remove the terminal block cover and the terminal block
holder. (Photo 6)
(15) Remove the terminal block by sliding it.
Photo 4
Switch holder
Screw of the
electrical cover.
Power monitor
receiver
P.C. board holder
Photo 5
Indoor fan motor
connector (CN211)
Indoor coil thermistor
connector (CN112)
Vane motor
connector (CN151)
Photo 6
3. Removing the electrical box
(1) Remove the horizontal vane, the panel (refer to 1.) and the
corner box.
(2) Remove the screw of Conduit cover, and then the indoor/
outdoor connecting wire. (Photo 2 or Photo 3)
(3) Remove the switch holder and the electrical cover. (Photo 4)
(4) Remove the ground wire connected to the heat exchanger
from the electrical box. (Photo 5)
(5) Disconnect the following connectors on the electronic
control P.C. board: the fan motor connector <CN211>, the
indoor coil thermistor connector <CN112>, the vane motor
connector <CN151>. (Photo 5)
(6) Unhook the catches of the electrical box, and pull out the
electrical box.
Screw
26
Ground wire
OPERATING PROCEDURE
PHOTOS
4. Removing the horizontal vane motor unit
Photo 7
(1) Remove the horizontal vane, the panel (refer to 1.) and the
corner box.
(2) Remove the screws of the horizontal vane motor unit, and
pull out the horizontal vane motor unit. (Photo 7)
(3) Disconnect the connector from the horizontal vane motor
unit.
5. Removing the indoor fan motor and the line flow fan
(1) Remove the horizontal vane, the panel (refer to 1.) and the
corner box.
(2) Remove the switch holder and the electrical box. (Refer to 3.)
(3) Remove the drain hose from the nozzle assembly, and
remove the nozzle assembly.
(4) Remove the screws fixing the motor bed. (Photo 8)
(5) Loosen the screw fixing the line flow fan. (Photo 9)
(6) Remove the motor bed together with fan motor and motor
band.
(7) Release the hooks of the motor band, and remove the
motor band then pull out the indoor fan motor.
(8) Remove the screws fixing the left side of the heat exchanger. (Photo 10)
(9) Lift the heat exchanger, and pull out the line flow fan to the
lower-left.
Screws of the
horizontal vane
motor unit
Photo 8
Screws of
the motor
bed
Photo 9
Screw of
the line flow
fan
Photo 10
Screws of the
left side of the
heat exchanger
27
Motor band
9-2. MSZ-A24NA MSY-A24NA MSZ-GA24NA MSY-GA24NA
OPERATING PROCEDURE
PHOTOS
1. Removing the front panel
(1) Remove the screw caps of the front panel. Remove the
screws.
(2) Pull the panel down to your side slightly and unhook the
catches at the top.
Photo 1
Front panel
Corner box
Screws
2. Removing the electronic control P.C. board, the receiver
P.C. board and the display P.C. board
(1) Remove the front panel. (Refer to 1.)
(2) Remove the corner box
(3) Remove the screw of the electrical cover.
Remove the electrical cover and T.B. SW cover.
(4) Remove the screw of the ground wire, which is soldermounted to the electronic control P.C. board.
(5) Remove the R.L holder.
(6) Remove the screw of the conduit cover.
(7) Remove the conduit cover.
(8) While pulling the electronic control P.C. board forward little
by little, disconnect all the connectors from the board.
(9) Remove the electronic control P.C. board.
(10) Open the R.L holder, remove the receiver P.C. board and
the display P.C. board.
Photo 2
Screw of the ground wire
Indoor
electronic
control
P.C. board
T.B. SW cover
Screw of
T.B. SW cover
Screw of the
electrical cover
Conduit cover
R.L
holder
3. Removing the electrical box
(1) Remove the front panel. (Refer to 1.)
(2) Remove the electrical cover. (Refer to 2.)
(3) Disconnect the connector of the indoor coil thermistors.
(4) Disconnect the indoor fan motor connector (CN211) and
the vane motor connector (CN151 and CN152) on the electronic control P.C. board.
(5) Remove the screw of ground wire to the heat exchanger.
(6) Remove the fan motor lead wire and indoor coil thermistor
from the electrical box.
(7) Remove the lead wire of vane motor from the bottom of
electrical box.
(8) Remove the screw fixing the electrical box and remove the
electrical box.
28
Photo 3
Screw of
conduit cover
Receiver
P.C. board
Screw of the
ground wire
Screw of the
electrical box
OPERATING PROCEDURE
PHOTOS
4. Removing the vane motor
Photo 4
(1) Remove the front panel. (Refer to 1.)
(2) Remove the electrical cover. (Refer to 2.)
Vane motors
(3) Remove the lead wire of vane motor. (Refer to 3.)
(4) Remove the R.L. holder.
(5) Pull out the drain hose from the nozzle assembly and remove
the nozzle assembly.
(6) Remove the screws of the vane motor and disconnect the
connector.
(7) Remove the vane motor.
Photo 5
Screws of the
vane motor
Vane motor
5. Removing the line flow fan and the indoor fan motor
Photo 6
(1) Remove the front panel. (Refer to 1.)
(2) Remove the electrical box. (Refer to 3.)
(3) Remove the drain hose from the nozzle assembly and
remove the nozzle assembly.
(4) Remove the water cut.
Screws fixing
(5) Slide the hole cover and remove the hole cover.
the left side
(6) Remove the hexagon socket set screw from the line flow fan. of the heat
(7) Remove the screws fixing the motor bed and remove the fan
exchanger
motor. (Be careful not to drop the fan motor because it is
heavy.)
(8) Remove the screws fixing the left side of the heat exchanger.
(9) Lift the left side of the heat exchanger.
Photo 7
(10) Remove the line flow fan.
Water cut
Photo 8
Hole
cover
Screws of the motor bed
29
Screws
of the
vane
motor
10
PARTS LIST
10-1. PARTS LIST (non-RoHS compliant)
MSZ-A09NA MSZ-A12NA MSY-A15NA MSY-A17NA MSZ-A15NA MSZ-A17NA
1. INDOOR UNIT STRUCTURAL PARTS
2. ACCESSORY AND REMOTE
CONTROLLER
9
1
12
11
10
8
2
7
(See 10-1.5.)
3
4
5
6
1. INDOOR UNIT STRUCTURAL PARTS
No.
Part No.
1
2
3
4
5
6
7
8
9
10
E02 A32 234
E02 A49 000
E02 913 067
E02 915 010
E02 915 100
E02 916 100
—
E02 A32 975
E02 913 970
E02 A49 978
Q'ty/unit
Symbol
MSZMSYin Wiring
Remarks
Diagram A09NA A12NA A15NA A17NA A15NA A17NA
BOX
1
1
1
1
1
1
Including No.3,4
PANEL ASSEMBLY
1
1
1
1
1
1
SCREW CAP
2
2
2
2
2
2
2 PC/SET
FRONT PANEL
1
1
1
1
1
1
CATECHIN AIR FILTER (LEFT)
1
1
1
1
1
1
CATECHIN AIR FILTER (RIGHT)
1
1
1
1
1
1
AIR CLEANING FILTER
1
1
1
1
1
1
MAC-415FT-E
CORNER BOX (RIGHT)
1
1
1
1
1
1
INSTALLATION PLATE
1
1
1
1
1
1
CONDUIT PLATE
1
1
1
1
1
1
Part name
2. ACCESSORY AND REMOTE CONTROLLER
E02 A54 426
REMOTE CONTROLLER
E02 A49 426
CONTROLLER
12 E02 527 083 REMOTE
HOLDER
1
11
1
30
1
1
1
1
1
1
1
1
1
1
KM06A
KM06C
MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSY-A15NA MSY-A17NA
3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS
1
18
17
14
15
16
2
3
4
5
6
11
10
9
12
No.
Part No.
Part name
1 E02 751 509
2 E02 001 504
3 E02 897 702
E02 A54 235
4
E02 A56 235
BEARING MOUNT
SLEEVE BEARING
DRAIN HOSE
5 E02 897 303
VANE MOTOR UNIT
(HORIZONTAL)
HORIZONTAL VANE
POWER MONITOR RECEIVER
P.C. BOARD HOLDER
CONDUIT COVER
TERMINAL BLOCK COVER
TERMINAL BLOCK HOLDER
TERMINAL BLOCK
6 E02 913 040
7 E02 915 095
8
9
10
11
E02 A49 979
E02 A49 780
E02 A49 779
E02 913 375
E02 A54 452
E02 A55 452
E02 A56 452
12
E02 A57 452
E02 A51 452
E02 A52 452
13 E02 897 308
NOZZLE ASSEMBLY
8
7
12
13
Q'ty/unit
Symbol
MSZMSYin Wiring
Diagram A09NA A12NA A15NA A17NA A15NA A17NA
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
MV
TB
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Remarks
UP & DOWN
1
1
ELECTRONIC CONTROL P.C.
BOARD 1
1
1
1
ROOM TEMPERATURE
THERMISTOR
RT11
1
1
E02 A54 307
1
1
RT12,
INDOOR COIL THERMISTOR
RT13
E02 A56 307
15 E02 915 782 SWITCH HOLDER
1
1
16 E02 A54 300 INDOOR FAN MOTOR 2
MF
1
1
17 E02 897 333 MOTOR BAND
1
1
18 E02 897 302 LINE FLOW FAN
1
1
1 Including SW P.C. BOARD and POWER MONITOR RECEIVER P.C. BOARD
2 Including FAN MOTOR RUBBER MOUNT (2 PC/SET)
14
31
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
RC0J30-□□
MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSY-A15NA MSY-A17NA
4. INDOOR UNIT HEAT EXCHANGER
1
2
3
No.
Part No.
E02 A54 620
E02 A56 620
E02 815 666
2
E02 155 666
3 E02 151 667
1
Part name
INDOOR HEAT EXCHANGER
UNION (GAS)
UNION (LIQUID)
Q'ty/unit
Symbol
MSZMSYin Wiring
Remarks
Diagram A09NA A12NA A15NA A17NA A15NA A17NA
1
1
1
1
1
1
1
1
ø3/8
1
1
1
1
ø1/2
1
1
1
1
1
1
ø1/4
5. AIR CLEANING FILTER (ANTI-ALLERGY ENZYME FILTER)
● AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity.
● Normal life of AIR CLEANING FILTER is 1 year.
If AIR CLEANING FILTER is to be washed, soak AIR CLEANING FILTER in water (when showing dirt, in lukewarm
water) and rinse it delicately, without removing the filter from the frame about once every 3 months.
● Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet.
● Do not remove or attach AIR CLEANING FILTER during unit operation.
Model
Part No.
MSZ-A09/12/15/17NA
MSY-A15/17NA
MAC-415FT-E
Replacement of the air cleaning filter
(2) Remove the air cleaning filter (Blue bellows type) from the catechin air filter.
(1) Remove the catechin air filter (left one).
The air cleaning filter is not attached to
the right side catechin air filter.
Air cleaning filter
(Blue bellows type)
32
MSZ-A24NA MSY-A24NA
7. INDOOR UNIT HEAT EXCHANGER
6. INDOOR UNIT STRUCTURAL PARTS
1
2
11
3
4
8
5
9
(See 10-1.10.)
12
13
6
7
6. INDOOR UNIT STRUCTURAL PARTS
Part number that is circled is not shown in the illustration.
Symbol
No.
Part No.
Part Name
in Wiring
Diagram
1 E02 527 970 INSTALLATION PLATE
2 E02 685 234 BOX
3 E02 888 000 FRONT PANEL ASSEMBLY
4 E02 408 142 CATCH
5 E02 685 067 SCREW CAP
6 E02 888 010 GRILLE
7 E02 534 100 CATECHIN AIR FILTER
8 E02 685 975 CORNER BOX (RIGHT)
9
-—
AIR CLEANING FILTER
10 E02 888 007 LAMP PANEL
Q'ty/unit
MSZ-A24NA
MSY-A24NA
1
1
1
4
3
1
2
1
2
1
1
1
1
4
3
1
2
1
2
1
1
1
1
1
1
1
Remarks
Including No.5,6
4 PC/SET
3 PC/SET
1 PC/SET
MAC-2300FT
7. INDOOR UNIT HEAT EXCHANGER
11 E02 A58 620 INDOOR HEAT EXCHANGER
12 E02 527 666 UNION (GAS)
13 E02 151 667 UNION (LIQUID)
33
ø5/8
ø1/4
MSZ-A24NA MSY-A24NA
9. ACCESSORY AND
REMOTE CONTROLLER
8. INDOOR UNIT FUNCTIONAL PARTS AND
ELECTRICAL PARTS
1
17
18
21
22
2
3
4
9
16
10
5
6
12
11
15
8
7
13
15
14
8. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS
Part numbers that is circled is not shown in the illustration.
No.
Part No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Symbol
in Wiring
Diagram
Part Name
E02 527 302
E02 408 509
E02 001 504
E02 408 702
E02 A58 235
E02 685 040
E02 685 041
E02 527 034
E02 A58 300
E02 448 303
E02 408 303
E02 918 333
E02 918 329
E02 918 468
E02 A58 452
15
E02 A53 452
16 E02 527 308
17 E02 A58 375
LINE FLOW FAN
BEARING MOUNT
SLEEVE BEARING
DRAIN HOSE
NOZZLE
VANE UPPER
VANE LOWER
VANE CRANK SET
INDOOR FAN MOTOR ASSEMBLY 1
VANE MOTOR (VERTICAL)
VANE MOTOR (HORIZONTAL)
MOTOR BAND
DISPLAY P.C. BOARD
RECEIVER P.C. BOARD
18 E02 918 307
INDOOR COIL THERMISTOR
19 E02 528 034
20 E02 529 034
VANE MOTOR SUPPORT SET(RIGHT)
VANE MOTOR SUPPORT SET(LEFT)
MF
MV2
MV1
ELECTRONIC CONTROL P.C. BOARD 2
ROOM TEMPERATURE THERMISTOR
TERMINAL BLOCK
RT11
TB
RT12,
RT13
Q'ty/unit
MSZ-A24NA
MSY-A24NA
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Remarks
RC0J56-□□
RIGHT & LEFT
UP & DOWN
1 Including FAN MOTOR RUBBER MOUNT
2 Including SW P.C. BOARD
9. ACCESSORY AND REMOTE CONTROLLER
E02 A58 426
REMOTE CONTROLLER
E02 A53 426
22 E02 527 083 REMOTE CONTROLLER HOLDER
21
1
1
34
1
1
KM06B
KM06D
10. AIR CLEANING FILTER (ANTI-ALLERGY ENZYME FILTER)
● AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity.
● Normal life of AIR CLEANING FILTER is 1 year.
If AIR CLEANING FILTER is to be washed, soak AIR CLEANING FILTER in water (when showing dirt, in lukewarm
water) and rinse it delicately, without removing the filter from the frame about once every 3 months.
● Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet.
● Do not remove or attach AIR CLEANING FILTER during unit operation.
Model
Part No.
MSZ-A24NA
MSY-A24NA
MAC-2300FT
Air cleaning filter
(Anti-allergy enzyme filter:blue bellows type)
35
10-2. RoHS PARTS LIST (RoHS compliant)
MSZ-A09NA MSZ-A12NA MSY-A15NA MSY-A17NA MSZ-A15NA MSZ-A17NA
2. ACCESSORY AND REMOTE
CONTROLLER
1. INDOOR UNIT STRUCTURAL PARTS
9
1
10
12
11
8
2
7
(See 10-2.5.)
3
4
5
6
No.
RoHS
1. INDOOR UNIT STRUCTURAL PARTS
Part No.
Part name
1 G E12 A32 234 BOX
Symbol
in Wiring
09NA
Diagram
- 1
1 1
Q'ty/unit
MSZ-A
12NA 15NA 17NA
- 1
- 1
- 1
1 1 1 1 1 1
MSY-A
15NA 17NA
- 1
- 1
1 1 1 1
Remarks
2 G E12 A49 000 PANEL ASSEMBLY
1
1
1
1
1
1
1
1
1
1
1
3 G E12 913 067
4 G E12 915 010
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
Including
No.3,4
2 2 PC/SET
1
5 G
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1 MAC-415FT-E
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
6 G
7 G
8 G
9 G
10 G
SCREW CAP
FRONT PANEL
AIR FILTER
E12 915 100 CATECHIN
(LEFT)
AIR FILTER
E12 916 100 CATECHIN
(RIGHT)
AIR CLEANING
—
FILTER
BOX
E12 A32 975 CORNER
(RIGHT)
E12 913 970 INSTALLATION PLATE
E12 A49 978 CONDUIT PLATE
1
2. ACCESSORY AND REMOTE CONTROLLER
G
G
11
G
G
E12 A54 426
E12 A49 426 REMOTE
E12 C30 426 CONTROLLER
E12 C22 426
REMOTE
12 G E12 527 083 CONTROLLER
HOLDER
1
1
1
1
1
1
1
1
1
1
36
1
1
1
1
1
1
1
1
1
1
1
1
KM06A
KM06C
1 KM07L
KM07J
1
MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSY-A15NA MSY-A17NA
3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS
1
3
4
19
18
17
15
16
2
5
6
12
11
10
No.
RoHS
12
Part No.
1 G E12 751 509
2 G E12 001 504
3 G E12 897 702
G E12 A54 235
4
G E12 A56 235
5 G E12 897 303
6 G E12 913 040
Part name
BEARING MOUNT
SLEEVE BEARING
DRAIN HOSE
NOZZLE ASSEMBLY
VANE MOTOR UNIT (HORIZONTAL)
HORIZONTAL VANE
POWER MONITOR RECEIVER
P.C. BOARD HOLDER
CONDUIT COVER
CONDUIT COVER
TERMINAL BLOCK
COVER
TERMINAL BLOCK
HOLDER
TERMINAL BLOCK
7
8
9
14
1
1
1
1
Q'ty/unit
MSZ-A
12NA 15NA 17NA
- 1
- 1
- 1
1 1 1 1 1 1
1 1 1 1 1 1
1 1 1 1 1 1
1 1
1 1 1 1
1 1 1 1 1 1
1 1 1 1 1 1
1
1
1
Symbol
in Wiring
Diagram 09NA1
1 1
1 1
1 1
1 1
MV
13
1
1
8 G E12 A49 979
1
1
1
9 G E12 C30 979
1
1
1
G E12 A49 780
1
1
1
10
G E12 C30 780
1
1
1
G E12 A49 779
1
1
1
11
G E12 C30 779
1
1
1
12 G E12 913 375
TB
1 1 1 1 1 1
1 1
G E12 A54 452
G E12 A55 452
1 1
G E12 A56 452 ELECTRONIC
1 1
13
CONTROL P.C.
G E12 A57 452 BOARD 1
G E12 A51 452
G E12 A52 452
1 1 1 1 1 1
14 G E12 897 308 ROOM TEMPERATURE THERMISTOR RT11
G E12 A54 307 INDOOR COIL
1 1 1 1
RT12,
15
RT13
G E12 A56 307 THERMISTOR
1 1
16 G E12 915 782 SWITCH HOLDER
1 1 1 1 1 1
MF
1 1 1 1 1 1
17 G E12 A54 300 INDOOR FAN MOTOR 2
18 G E12 897 333 MOTOR BAND
1 1 1 1 1 1
19 G E12 897 302 LINE FLOW FAN
1 1 1 1 1 1
1 Including SW P.C. BOARD and POWER MONITOR RECEIVER P.C. BOARD
2 Including FAN MOTOR RUBBER MOUNT (2 PC/SET)
1
7 G E12 915 095
37
1
1
1
MSY-A
15NA 17NA
- 1
- 1
1 1 1 1
1 1 1 1
1 1 1 1
1
1
1
1
1
1
1
1
1
1
1 UP & DOWN
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Remarks
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1 RC0J30-□□
1
1
MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSY-A15NA MSY-A17NA
4. INDOOR UNIT HEAT EXCHANGER
1
2
No.
1
2
3
RoHS
3
Part No.
G
G
G
G
G
E12 A54 620
E12 A56 620
E12 815 666
E12 155 666
E12 151 667
Part name
Symbol
in Wiring
Diagram
INDOOR HEAT
EXCHANGER
09NA
- 1
1
1
1
UNION (GAS)
UNION (LIQUID)
Q'ty/unit
MSZ-A
12NA
15NA
17NA
- 1
- 1
- 1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
MSY-A
15NA
17NA
- 1
- 1
1
1
1
1
1
1
1
1
1
1
1
1
Remarks
ø3/8
ø1/2
ø1/4
5. AIR CLEANING FILTER (ANTI-ALLERGY ENZYME FILTER)
● AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity.
● Normal life of AIR CLEANING FILTER is 1 year.
If AIR CLEANING FILTER is to be washed, soak AIR CLEANING FILTER in water (when showing dirt, in lukewarm
water) and rinse it delicately, without removing the filter from the frame about once every 3 months.
● Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet.
● Do not remove or attach AIR CLEANING FILTER during unit operation.
Model
Part No.
MSZ-A09/12/15/17NA
MSY-A15/17NA
MAC-415FT-E
Replacement of the air cleaning filter
(2) Remove the air cleaning filter (Blue bellows type) from the catechin air filter.
(1) Remove the catechin air filter (left one).
The air cleaning filter is not attached to
the right side catechin air filter.
Air cleaning filter
(Blue bellows type)
38
MSZ-A24NA MSY-A24NA MSZ-GA24NA MSY-GA24NA
7. INDOOR UNIT HEAT EXCHANGER
6. INDOOR UNIT STRUCTURAL PARTS
1
2
11
3
4
8
5
9
(See 10-2.10.)
12
13
6
7
6. INDOOR UNIT STRUCTURAL PARTS
No.
RoHS
Part number that is circled is not shown in the illustration.
1
2
3
4
5
6
7
8
9
10
G
G
G
G
G
G
G
G
G
G
Part No.
E12 527 970
E12 685 234
E12 888 000
E12 408 142
E12 685 067
E12 888 010
E12 534 100
E12 685 975
—
E12 888 007
Part Name
Symbol
in Wiring
Diagram
INSTALLATION PLATE
BOX
FRONT PANEL ASSEMBLY
CATCH
SCREW CAP
GRILLE
CATECHIN AIR FILTER
CORNER BOX (RIGHT)
AIR CLEANING FILTER
LAMP PANEL
Q'ty/unit
MSZMSYRemarks
A24NA GA24 A24NA GA24
NA
NA
- 1
- 1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1 Including No.5,6
4
4
4
4
4
4 4 PC/ SET
3
3
3
3
3
3 3 PC/ SET
1
1
1
1
1
1
2
2
2
2
2
2 1 PC/ SET
1
1
1
1
1
1
2
2
2
2
2
2 MAC-2300FT
1
1
1
1
1
1
7. INDOOR UNIT HEAT EXCHANGER
11
12
13
G
G
G
E12 A58 620 INDOOR HEAT EXCHANGER
E12 527 666 UNION (GAS)
E12 151 667 UNION (LIQUID)
1
1
1
39
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
ø5/8
ø1/4
MSZ-A24NA MSY-A24NA MSZ-GA24NA MSY-GA24NA
8. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS
18
1
2
17
3
4
9
16
10
5
6
12
11
15
8
7
13
14
15
No.
RoHS
Part numbers that are circled are not shown in the illustration.
1
2
3
4
5
6
7
8
G
G
G
G
G
G
G
G
9
10
11
12
13
14
15
16
Part No.
Part Name
Symbol
in Wiring
Diagram
E12 527 302
E12 408 509
E12 001 504
E12 408 702
E12 A58 235
E12 685 040
E12 685 041
E12 527 034
LINE FLOW FAN
BEARING MOUNT
SLEEVE BEARING
DRAIN HOSE
NOZZLE
VANE UPPER
VANE LOWER
VANE CRANK SET
FAN MOTOR
G E12 A58 300 INDOOR
MF
ASSEMBLY 1
G E12 448 303 VANE MOTOR (VERTICAL)
MV2
G E12 408 303 VANE MOTOR (HORIZONTAL)
MV1
G E12 918 333 MOTOR BAND
G E12 918 329 DISPLAY P.C. BOARD
G E12 918 468 RECEIVER P.C. BOARD
G E12 A58 452
G E12 A53 452 ELECTRONIC CONTROL P.C.
G E12 E34 452 BOARD 2
G E12 E35 452
TEMPERATURE
G E12 527 308 ROOM
RT11
THERMISTOR
G E12 A58 375 TERMINAL BLOCK
TB
G E12 918 307 INDOOR COIL THERMISTOR
RT12, RT13
G E12 528 034 VANE MOTOR SUPPORT SET (RIGHT)
G E12 529 034 VANE MOTOR SUPPORT SET (LEFT)
17
18
19
20
1 Including FAN MOTOR RUBBER MOUNT
2 Including SW P.C. BOARD
40
Q'ty/unit
MSZMSYA24NA GA24 A24NA GA24
NA
NA
- 1
- 1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Remarks
1
1
1
1
1
1
RC0J56-□□
2
1
1
1
1
1
2
1
1
1
1
1
2
1
1
1
1
2
1
1
1
1
2
1
1
1
1
2
1
1
1
1
RIGHT & LEFT
UP & DOWN
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
MSZ-A24NA MSY-A24NA MSZ-GA24NA MSY-GA24NA
9. ACCESSORY AND REMOTE CONTROLLER
2
No.
1
2
RoHS
1
G
G
G
G
G
Part No.
Symbol
in Wiring
Diagram
Part Name
E12 A58 426
E12 A53 426
REMOTE CONTROLLER
E12 C26 426
E12 C29 426
E12 527 083 REMOTE CONTROLLER HOLDER
Q'ty/unit
MSZMSYRemarks
A24NA GA24 A24NA GA24
NA
NA
- 1
- 1
1
KM06B
1
KM06D
1
1
KM07K
1
1 KM07M
1
1
1
1
1
1
10. AIR CLEANING FILTER (ANTI-ALLERGY ENZYME FILTER)
● AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity.
● Normal life of AIR CLEANING FILTER is 1 year.
If AIR CLEANING FILTER is to be washed, soak AIR CLEANING FILTER in water (when showing dirt, in lukewarm
water) and rinse it delicately, without removing the filter from the frame about once every 3 months.
● Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet.
● Do not remove or attach AIR CLEANING FILTER during unit operation.
Model
Part No.
MSZ-A24NA MSY-A24NA
MSZ-GA24NA MSY-GA24NA
MAC-2300FT
Air cleaning filter
(Anti-allergy enzyme filter:blue bellows type)
41
11
MICROPROCESSOR CONTROL
MSZ-A09NA MSZ-A12NA MSZ-A15NA MSZ-A17NA MSZ-A24NA
MSY-A15NA MSY-A17NA MSY-A24NA MSZ-GA24NA MSY-GA24NA
WIRELESS REMOTE CONTROLLER
These pictures show MSZ-A24.
Signal transmitting section
(This diagram shows an overall view.)
Operation display section
ON/OFF (operate/
stop) button
VANE button
(Horizontal vane button)
Fan speed control button
Temperature buttons
Off-timer button
Operation select button
Indication of
remote controller
model is on back
ECONO COOL button
On-timer button
WIDE VANE button
(Vertical vane button)
(MSZ-A24, MSY-A24)
TIME set buttons
Forward button
Backward button
POWERFUL button
CLOCK set button
RESET button
NOTE
Use the remote controller
provided with the unit only.
Do not use other remote
controller.
overall view.)
view.)
(This diagram shows an overall
Once the operation mode is set, the same operation mode can be repeated by simply turning OPERATE/STOP (ON/OFF) button ON.
Indoor unit receives the signal with a beep tone.
When the system turns OFF, 3-minute time delay will operate to protect system from overload and compressor will not restart
for 3 minutes.
INDOOR UNIT DISPLAY SECTION
Operation Indicator lamp
The operation indicator at the right side of the indoor unit indicates the operation state.
•The following indication applies regardless of shape of the indication.
Indication
Difference between
target temperature
and room temperature
Operation state
Lighted
This shows that the air conditioner is
operating to reach the target temperature.
Please wait until the target temperature is
obtained.
Approx. 4°F or more
This shows that the room temperature is
approaching the target temperature.
Approx. 4°F or less
This shows a state of standby for operation.
(For multi system air conditioner)
42
Blinking
—
Not lighted
11-1. COOL (
) OPERATION
(1) Press OPERATE/STOP (ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select COOL mode with OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.
The setting range is 61 ~ 88°F.
1. Coil frost prevention
When the temperature of indoor heat exchanger becomes too low, the coil frost prevention mode works.
The indoor fan operates at the set speed and the compressor stops. This mode continues until the temperature of indoor
heat exchanger rises.
2. Low outside temperature operation
When the outside temperature lowers during cool mode operation, low outside temperature operation starts, and the outdoor fan slows or stops.
11-2. DRY (
) OPERATION
(1) Press OPERATE/STOP (ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select DRY mode with OPERATION SELECT button.
(3) The set temperature is determined from the initial room temperature.
1. Coil frost prevention
Coil frost prevention is as same as COOL mode. (11-1.1.)
2. Low outside temperature operation
Low outside temperature operation is as same as COOL mode. (11-1.2.)
11-3. HEAT (
) OPERATION (MSZ)
(1) Press OPERATE/STOP (ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select HEAT mode with OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.
The setting range is 61 ~ 88°F.
1. Cold air prevention control
When the compressor is not operating or is starting, and the temperature of indoor heat exchanger and/or the room temperature is low or when defrosting is being done, the indoor fan will stop or rotate in Very Low speed.
2. High pressure protection
In HEAT operation the compressor operational frequency is controlled by the temperature of the indoor heat exchanger to
prevent the condensing pressure from increasing excessively.
3. Defrosting
Defrosting starts when the temperature of outdoor heat exchanger becomes too low.
The indoor/outdoor fans stop, the 4-way valve reverses, and the compressor starts.
This mode continues until the temperature of outdoor heat exchanger rises or the fixed time passes.
11-4. FAN(
)OPERATION (MSY)
(1) Press OPERATE/STOP (ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns ON with a beep tone.
(2) Select FAN mode with OPERATION SELECT button.
(3) Select the desired fan speed. When AUTO, it becomes Low.
Only indoor fan operates. Outdoor unit does not operate.
11-5. “I FEEL CONTROL” (
) OPERATION (MSY)
(1) Press OPERATE/STOP (ON/OFF) button on the remote controller. OPERATION INDICATOR lamp of the indoor unit
turns on with a beep tone.
(2) Select “I FEEL CONTROL” mode with OPERATION SELECT button.
(3) The operation mode is determined by the room temperature at start-up of the operation.
• Once the mode is fixed, the mode does not change by room temperature afterwards.
• Under the ON-TIMER (
) operation, mode is determined according to the room temperature at the set time the
operation starts.
43
(4) The initial set temperature is decided by the initial room temperature.
Initial room temperature
Model
Initial set temperature
79°F or more
75°F
COOL mode of "I FEEL CONTROL"
77 to 79°F
Less than 77°F
Initial room temperature minus 4°F
DRY mode of "I FEEL CONTROL"
Initial room temperature minus 4°F
(5) TEMPERATURE buttons
In “I FEEL CONTROL” (
) mode, set temperature is decided by the microprocessor based on the room temperature.
In addition, set temperature can be controlled by TOO WARM or TOO COOL buttons when you feel too cool or too warm.
Each time the TOO WARM or TOO COOL button is pressed, the indoor unit receives the signal and emits a beep tone.
• Fuzzy control
When the TOO COOL or TOO WARM button is pressed, the microprocessor changes the set temperature, considering
the room temperature, the frequency of pressing TOO COOL or TOO WARM button and the user’s preference to heat or
cool. So this is called “Fuzzy control”, and works only in “I FEEL CONTROL” mode.
In DRY mode of “I FEEL CONTROL”, the set temperature does not change.
TOO
COOL
…To raise the set temperature 2~4°F
TOO
WARM
…To lower the set temperature 2~4°F
11-6. AUTO CHANGE OVER ··· AUTO MODE OPERATION (MSZ)
Once desired temperature is set, unit operation is switched automatically between COOL and HEAT operation.
Mode selection
(1) Initial mode
When unit starts the operation with AUTO operation from OFF:
• If the room temperature is higher than the set temperature, operation starts in COOL mode.
• If the room temperature is equal to or lower than the set temperature, operation starts in HEAT mode.
(2) Mode change
COOL mode changes to HEAT mode when about 15 minutes have passed with the room temperature 2~4°F below the
set temperature.
HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 2~4°F above the
set temperature.
NOTE:
If two or more indoor units are operating in multi system, there might be a case that the indoor unit, which is operating in
(AUTO), cannot change over to the other operating mode (COOL ↔ HEAT) and becomes a state of standby.
Refer to 8-1. ”INFORMATION FOR MULTI SYSTEM AIR CONDITIONER”.
44
11-7. AUTO VANE OPERATION
1. Horizontal vane
(1) Vane motor drive
These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of
the motor are controlled by pulse signals (approx. 12 V) transmitted from indoor microprocessor.
(2) The horizontal vane angle and mode change as follows by pressing VANE CONTROL button.
MSZ-A09/12/15/17
MSY-A15/17
MSZ-A24 MSY-A24
MSZ-GA24 MSY-GA24
(3) Positioning
The vane is once pressed to the vane stopper to confirm the standard position and then set to the desired angle.
Confirming of standard position is performed in the following cases.
(a) When the operation starts or finishes (including timer operation).
(b) When the test run starts.
(c) When multi-standby starts or finishes.
) mode
(4) VANE AUTO (
In VANE AUTO mode, the microprocessor automatically determines the vane angle and operation to make the optimum
room-temperature distribution.
(1) COOL and DRY operation
Vane angle is fixed to Horizontal position or Angle 1.
(2) HEAT operation (MSZ)
Vane angle is fixed to Angle 4.
Upward
(5) STOP (operation OFF) and ON-TIMER standby
In the following cases, the horizontal vane returns to the closed position.
(a) When OPERATE/STOP (ON/OFF) button is pressed (POWER OFF).
(b) When the operation is stopped by the emergency operation.
(c) When ON-TIMER is ON standby.
(6) Dew prevention
During COOL or DRY operation with the vane angle at Angle 2 ~ 4 (A09 ~ 17) / Angle 3 ~ 5 (A24) / Angle 4 ~ 5 (GA24)
when the compressor cumulative operation time exceeds 1 hour, the vane angle automatically changes to Angle 1 for
dew prevention.
(7) SWING MODE (
)
By selecting SWING mode with VANE CONTROL button, the horizontal vane swings vertically. The remote controller
displays “
”.
(8) Cold air prevention in HEAT operation (MSZ)
The horizontal vane position is set to Upward.
NOTE: When 2 or more indoor units are operated with multi outdoor unit, even if any indoor unit turns thermostat
OFF, this control does not work in the indoor unit.
45
(9) To change the airflow direction not to blow directly onto your body. (MSZ-A09/12/15/17, MSY-A15/17)
HEAT
(For MSZ)
Pressing and holding
Use this function if you do The air conditioner starts the
The air conditioner starts heating
VANE CONTROL button not want the air from the
cooling or drying operation ap- operation approx. 3 minutes after the
for 2 seconds or more, indoor unit to blow directly prox. 3 minutes after the vane
vane has moved to the horizontal
the horizontal vane
onto your body.
has moved to the horizontal
position.
reverses and moves
• Depending on the shape position.
• Sometimes the area around your
horizontal position.
of the room, the air may
• When VANE CONTROL butfeet may not get warm. To warm
blow directly onto your
ton is pressed again, the vane
the area around the feet, set the
body.
returns to the previously-set
horizontal vane to (AUTO) or the
position and the air conditioner downward-blowing position.
• Press VANE CONTROL
starts the cool or dry operation
Horizontal
• When VANE CONTROL button is
button again to return the
in approx. 3 minutes.
position
pressed again, the vane returns to
vane to the previously-set
the previously-set position and the
position.
air conditioner starts the heat operation in approx. 3 minutes.
To change the airflow
direction
When to use this function?
COOL/DRY
NOTE:
• If you make the airflow not to blow directly onto your body by pressing VANE CONTROL button, the compressor stops for 3
minutes even during the operation of the air conditioner.
• The air conditioner operates with Very Low speed until the compressor turns on again.
(10) ECONO COOL (
) operation (ECONOmical operation)
When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 3.6°F higher than that in
COOL mode.
Also the horizontal vane swings in various cycle.
SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher than that
in COOL mode, the air conditioner can keep comfort. As a result, energy can be saved.
ECONO COOL operation is cancelled when ECONO COOL button is pressed once again or VANE CONTROL button is
pressed or change to other operation mode.
(11) POWERFUL ( ) operation
The air conditioner automatically adjusts the fan speed and the set temperature, and operates the POWERFUL mode.
The POWERFUL mode is automatically released 15 minutes after operation starts, and the operation mode returns to
the mode prior to POWERFUL operation.
2. Vertical vane (MSZ-A24, MSY-A24, MSZ-GA24, MSY-GA24)
(1) Vane motor drive
These models are equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the
motor are controlled by pulse signals (approx. 12 V) transmitted from microprocessor.
(2) The vertical vane angle and mode change as follows by pressing WIDE VANE button.
1
2
3
4
SWING
5
6
(3) Positioning
The vane is once pressed to the vane stopper to confirm the standard position and then set to the desired angle.
Confirming of standard position is performed in the following cases.
(a) When OPERATE/STOP (ON/OFF) button is pressed (POWER ON/OFF).
(b) When SWING is started or finished.
(c) When the power supply turns ON.
(4) SWING MODE (
)
By selecting SWING mode with WIDE VANE button, the vertical vane swings horizontally.
The remote controller displays “
”.
46
(5) WIDE MODE (
)
By selecting WIDE mode with WIDE VANE button, indoor fan speed becomes faster than setting fan speed on the
remote controller ( ). The remote controller displays “
”.
NOTE: The position of vane angle 3, angle 4 and angle 5 are different in COOL operation and HEAT operation.
Indoor fan speed becomes faster than setting fan speed on the remote controller even when
or
selected.
is
11-8. TIMER OPERATION
1. How to set the time
(1) Press OPERATE/STOP (ON/OFF) button to start the air conditioner.
(2) Check that the current time is set correctly.
NOTE: Timer operation will not work without setting the current time. Initially “0:00” blinks at the current time display of
TIME MONITOR, so set the current time correctly with CLOCK SET button.
How to set the current time
(1) Press the CLOCK set button.
(2) Press the TIME SET buttons (
and
) to set the current time.
) is press, the set time increases by 1 minute, and each time BACKWARD button (
• Each time FORWARD button (
) is press, the set time decreases by 1 minute.
• Pressing those buttons longer increases / decreases the set time by 10 minutes.
Press the CLOCK set button.
ON timer setting
(1) Press ON-TIMER button(
) during operation.
(2) Set the time of the timer using TIME SET buttons (
and
).
OFF timer setting
) during operation.
(1) Press OFF-TIMER button (
(2) Set the time of the timer using TIME SET buttons (
and
).
Each time FORWARD button (
) is pressed, the set time increases by 10 minutes: each time BACKWARD button (
) is pressed, the set time decreases by 10 minutes.
2. Cancel
To cancel ON timer, press ON-TIMER button (
).
To cancel OFF timer, press OFF-TIMER button(
).
TIMER is cancelled and the display of set time disappears.
PROGRAM TIMER
• OFF timer and ON timer can be used in combination. The timer of the set time that is reached first will operate first.
• “ ” and “ ” display shows the order of OFF timer and ON timer operation.
(Example 1) The current time is 8:00 PM.
The unit turns OFF at 11:00 PM, and ON at 6:00
AM.
(Example 2) The current time is 11:00 AM.
The unit turns ON at 5:00 PM, and OFF at 9:00
PM.
NOTE: If the main power is turned OFF or a power failure occurs while AUTO START/STOP timer is active, the timer setting is cancelled. As these models are equipped with an auto restart function, the air conditioner starts operating
with timer cancelled when power is restored.
47
11-9. EMERGENCY/TEST OPERATION
In case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the front of the indoor
unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of the remote
controller run down. The unit will start and OPERATION INDICATOR lamp will light.
The first 30 minutes of operation is the test run operation. This operation is for servicing. The Indoor fan speed runs at
High speed and the system is in continuous operation (with thermostat ON).
After 30 minutes of test run operation the system shifts to EMERGENCY COOL/HEAT MODE with a set temperature of 75°F.
The fan speed shifts to Med.
All protective operations such as the coil frost prevention works even in emergency operation.
In the test run or emergency operation, the horizontal vane operates in VANE AUTO (
) mode.
Emergency operation continues until EMERGENCY OPERATION switch is pressed once or twice or the unit receives any
signal from the remote controller. In case of latter normal operation will start.
NOTE: Do not press EMERGENCY OPERATION switch during normal operation.
E.O.
SW
EMERGENCY OPERATION switch
Operation mode
COOL
Set temperature
75°F
HEAT (MSZ)
75°F
Fan speed
Med.
Med.
Horizontal vane
Auto
Auto
The operation mode is indicated by the Operation
Indicator lamp as following
MSZ type
MSY type
EMERGENCY
COOL
EMERGENCY
COOL
↓
EMERGENCY
HEAT
↓
STOP
↓
STOP
Lighted
Not lighted
11-10. Changing temperature indication (°F/°C)
MSZ-A•NA-
1
MSY-A•NA-
1
MSZ-GA MSY-GA
The preset unit is °F.
Press RESET button while
the temperature buttons
are pressed.
Press RESET button gently
using a thin stick.
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
© Copyright 2006 MITSUBISHI ELECTRIC CO.,LTD
Distributed in Mar. 2009. No. OB450 REVISED EDITION-D 4
Distributed in Jun. 2008. No. OB450 REVISED EDITION-C 6
Distributed in May 2007. No. OB450 REVISED EDITION-B 7
Distributed in Dec. 2006. No. OB450 REVISED EDITION-A 7
Distributed in Apr. 2006. No. OB450 7
Made in Japan
New publication, effective Mar. 2009
Specifications subject to change without notice.